ICR rifling means "Internal Curved Radius." The CEO finally told me what it means. I also have permission to post pics of the rifling. From John at LW:

"If you look at the rifling there are no sharp edges just a radius on a radius. We have been making this type of rifling for 5 to 6 years, just haven’t advertised it. We just make barrels for the industry and don’t advertise or post anything on the internet."

This is after a couple hundred rounds from my Vintage Sniper competition rifle. There was minimal fouling in the barrel and it cleaned up with two wet patches, a few strokes of a bore brush with Bore Tech copper cleaner and three more passes with dry patches. There are just tints or stains of copper at some points and no actual copper fouling.






Here's a muzzle view of the rifling.


For those that didn't see my posts before, I got a 45 FPS velocity gain over conventional 4-groove rifling and it even shot faster than one of my 5R barrels. I got 2705 FPS out of a 22" barrel with ICR rifling while getting 2650 out of conventional rifling with ammo from the same box and the same length.

This is also the same barrel that shot the 0.6 MOA groups at 300 yards with 155 grain ELD-M's.




Tony.

Kinda looks like 5R “squared”.
Interesting…thanks for the info!

Tony,

thanks for posting this. Good information for the user community.

Wes

Looks like a variation on the polygonal rifling used by HK and Glock.

quote:

Originally posted by SgtGold:
Looks like a variation on the polygonal rifling used by HK and Glock.

Here's a description of what radius over radius means.You have the groove radius, which originates from the centerline of the barrel and the land radius which originates from outside the barrel.


Tony.

Very cool. Makes sense that it would foul less.

Thanks for sharing.

How in the world would you make a barrel like that ?? Cool !

Benny, Jim would be proud of you man. You've really excelled at the M14.

quote:

Originally posted by arcwelder:
Benny, Jim would be proud of you man. You've really excelled at the M14.

Thanks for the kind words, my friend!

Tony.